CN110589723A - Hydraulic control system for electric forklift gantry - Google Patents
Hydraulic control system for electric forklift gantry Download PDFInfo
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- CN110589723A CN110589723A CN201910973385.2A CN201910973385A CN110589723A CN 110589723 A CN110589723 A CN 110589723A CN 201910973385 A CN201910973385 A CN 201910973385A CN 110589723 A CN110589723 A CN 110589723A
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- 238000000034 method Methods 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 11
- 239000003921 oil Substances 0.000 description 181
- 230000009977 dual effect Effects 0.000 description 8
- 239000010720 hydraulic oil Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Transportation (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
The invention discloses a hydraulic control system for a gantry of an electric forklift, which comprises: the reversing valve is connected to a lifting oil cylinder of the gantry through a zero-leakage valve; the oil supply system is connected with the reversing valve, the valve core of the reversing valve is positioned at a first working position, and the valve core of the zero-leakage valve is positioned at an oil supply working position; and the lifting oil cylinder is communicated with the oil tank through the zero-drain valve and the reversing valve in sequence so that oil in the lifting oil cylinder flows to the oil tank. The descending control process of the portal frame does not need to start a motor, and the zero-leakage valve is controlled by the energy accumulator to be reversed, so that the starting frequency of the motor can be reduced.
Description
Technical Field
The invention relates to the technical field of forklifts, in particular to a hydraulic control system for an electric forklift gantry.
Background
In the prior art, in a typical electric forklift, when a gantry performs lifting motion, a motor is required to drive a hydraulic oil pump to supply oil to a lifting oil path, so that a lifting oil cylinder connected with the gantry rises. During the descending movement of the gantry, the motor and the oil pump are still required to be started to charge the pilot oil path of the zero-leakage valve connected with the lifting oil cylinder, so that the zero-leakage valve is reversed, the oil in the lifting oil cylinder can flow out through the zero-leakage valve, and the gantry can descend, therefore, the lifting of the gantry usually needs to be repeatedly started and stopped, and the service life of the motor can be reduced.
Therefore, how to reduce the starting frequency of the motor in the oil supply system is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of this, the present invention provides a hydraulic control system for an electric forklift gantry, which can reduce the frequency of turning on a motor in an oil supply system.
In order to achieve the purpose, the invention provides the following technical scheme:
an electric forklift mast hydraulic control system, comprising:
the reversing valve is connected to a lifting oil cylinder of the gantry through a zero-leakage valve;
the oil supply system is connected with the reversing valve, the valve core of the reversing valve is in a first working position, and the valve core of the zero leakage valve is in an oil supply working position, and the oil supply system is communicated with the lifting oil cylinder through the reversing valve and the zero leakage valve so as to supply oil to the lifting oil cylinder and further lift the gantry;
and in the state of the second working position, the energy accumulator is communicated with the drainage guide cavity of the zero drainage valve through the reversing valve so as to switch the valve core of the zero drainage valve to the drainage working position, the valve core of the reversing valve is in the second working position, and the valve core of the zero drainage valve is in the drainage working position, the lifting oil cylinder is communicated with the oil tank through the zero drainage valve and the reversing valve in sequence so that oil in the lifting oil cylinder flows to the oil tank, and the gantry descends.
Preferably, the oil supply system comprises a first motor and a duplex pump connected to an output end of the first motor; a first pump body in the double pump is connected with a forklift control oil way, and the forklift control oil way comprises the reversing valve; and a second pump body in the duplex pump is connected with the energy accumulator.
Preferably, the forklift control oil path comprises a steering control oil path and the reversing valve, and the first pump body is respectively connected with the steering control oil path and the reversing valve through a priority valve in the oil supply system.
Preferably, the oil supply system further comprises a second motor and a second oil pump connected to the second motor, and the second oil pump is connected to the reversing valve.
Preferably, the reversing valve is a pilot reversing valve, and the accumulator is connected with the first pilot cavity of the pilot reversing valve to switch the valve core of the pilot reversing valve to the second working position.
Preferably, the second pump body is connected with a brake oil path, and the brake oil path comprises the accumulator.
Preferably, the oil supply system is connected with the second pilot cavity of the pilot reversing valve to switch the spool of the pilot reversing valve to the first working position.
Preferably, the oil supply system further comprises a handle reversing valve group used for manual reversing and connected to the reversing valve, the energy accumulator is connected to the handle reversing valve group through a first pressure reducing valve, and the oil supply system is connected to the handle reversing valve group through a second pressure reducing valve;
the second pressure reducing valve forms a communicated oil path between the handle reversing valve group and the second pilot cavity when the handle reversing valve group is in a door frame lifting position, so that the valve core of the reversing valve is switched to the first working position;
and the handle reversing valve group is in a state that the gantry descends, and the first reducing valve forms a communicated oil path between the handle reversing valve group and the first pilot cavity so that the valve core of the reversing valve is switched to the second working position.
Preferably, the first pressure reducing valve and the second pressure reducing valve are pilot pressure reducing valves.
Preferably, the zero-leakage valve is in a one-way communication state from the pilot reversing valve to the lifting oil cylinder when a valve core of the zero-leakage valve is in the oil supply working position.
The invention provides a hydraulic control system for an electric forklift gantry, which comprises: the reversing valve is connected to a lifting oil cylinder of the gantry through a zero-leakage valve; the oil supply system is connected with the reversing valve, the valve core of the reversing valve is positioned at a first working position, and the valve core of the zero-leakage valve is positioned at an oil supply working position, and the oil supply system is communicated with the lifting oil cylinder through the reversing valve and the zero-leakage valve so as to supply oil to the lifting oil cylinder; and the lifting oil cylinder is communicated with the oil tank through the zero-drain valve and the reversing valve in sequence so that oil in the lifting oil cylinder flows to the oil tank.
The descending control process of the portal frame does not need to start the motor, and only the energy accumulator is used for providing pilot oil to control the zero-leakage valve to change the direction, so that the starting frequency of the motor in the oil supply system is reduced, and the service life of the motor is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a connection of a control system according to the present invention;
FIG. 2 is a schematic diagram of a portion of an oil circuit of the control system provided by the invention during descending of the energy accumulator control gantry;
FIG. 3 is a schematic diagram of a part of an oil path of the control system provided by the invention in the process of controlling the lifting of a gantry by a second oil pump;
fig. 4 is a schematic diagram of a part of oil circuit of the control system provided by the invention in the process of controlling the lifting of the gantry by the duplex pump.
In fig. 1 to 4:
1-duplex pump, 101-first pump body, 102-second pump body, 2-second oil pump, 3-first motor, 4-second motor, 5-multi-way valve, 6-second pressure reducing valve, 7-pilot reversing valve, 701-first pilot cavity, 702-second pilot cavity, 8-zero drain valve, 9-lifting oil cylinder, 10-steering control oil way, 11-priority valve, 12-braking oil way, 13-energy accumulator, 14-pilot oil source valve block, 15-electromagnetic reversing valve, 16-first pressure reducing valve, 17-protection valve and 18-handle reversing valve group.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the invention is to provide a hydraulic control system for the gantry of the electric forklift, which can reduce the starting frequency of a motor in an oil supply system.
In the description of the present invention, it should be noted that the terms upper, lower, left, right, etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Moreover, the use of the ordinal numbers first, second, etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In one embodiment of the hydraulic control system for the electric forklift gantry, please refer to fig. 1, which includes a reversing valve, a zero-leakage valve 8, an oil supply system and an accumulator 13. The supply valve and the accumulator 13 are connected to the reversing valve. The reversing valve is connected with a lifting oil cylinder 9 of the gantry through a zero-leakage valve 8.
And under the condition that the valve core of the reversing valve is at the first working position and the valve core of the zero-leakage valve 8 is at the oil supply working position, the oil supply system is communicated with the lifting oil cylinder 9 of the gantry through the reversing valve and the zero-leakage valve 8 so as to supply oil to the lifting oil cylinder 9 and further lift the gantry.
And when the valve core of the reversing valve is in the second working position, the energy accumulator 13 is communicated with the leakage flow guide cavity of the zero leakage valve 8 through the reversing valve so as to switch the valve core of the zero leakage valve 8 to the leakage flow working position. Specifically, as shown in fig. 2, when the spool of the reversing valve is in the second working position and the spool of the zero-leakage valve 8 is switched to the leakage working position by the oil provided by the energy accumulator 13, the lifting cylinder 9 is communicated with the oil tank through the zero-leakage valve 8 and the reversing valve in sequence, so that the oil in the lifting cylinder 9 flows into the oil tank through the zero-leakage valve 8 and the reversing valve in sequence, and the gantry descends. The zero-leakage valve 8 can be reset through an inner spring thereof, so that the valve core returns to the oil supply working position.
The oil transmission is realized through oil pipes for the parts needing oil transmission, such as the valve, the pump and the like, which are connected together.
In the embodiment, the descending control process of the gantry does not need to start the motor, and only the energy accumulator 13 is used for providing pilot oil to control the zero-leakage valve 8 to change the direction, so that the starting frequency of the motor in an oil supply system is reduced, and the service life of the motor is prolonged.
Further, the oil supply system includes a first motor 3 and a tandem pump 1 connected to an output end of the first motor 3. The first pump body 101 in the dual pump 1 is connected with a forklift control oil path, the forklift control oil path comprises a reversing valve, namely, the forklift control oil path comprises a gantry control oil path, the first pump body 101 can supply oil to the lifting oil cylinder 9 through the reversing valve, and in addition, the forklift control oil path can also comprise other oil paths for controlling the operation of a forklift. The gantry control oil path comprises the oil path of the gantry lifting control part with the reversing valve, the zero-leakage valve 8 and the like in the embodiment, and can also comprise oil paths for other types of movement of the gantry. The second pump body 102 of the tandem pump 1 is connected to the accumulator 13, so that the accumulator 13 is supplied with oil in time by the second pump body 102, and the oil can be stored in the accumulator 13 in advance. The first motor 3 drives the dual pump 1, so that oil can be supplied to the lifting oil cylinder 9 and the energy accumulator 13, the control is convenient, and the first motor 3 does not need to be started repeatedly.
Further, the forklift control oil path comprises a steering control oil path 10 and a reversing valve, and the first pump body 101 is connected with the steering control oil path 10 and the reversing valve through a priority valve 11 in the oil supply system. Specifically, it is preferable that the valve rotates to supply oil to the direction change valve after the oil pressure of the first pump body 101 supplied to the steering control oil passage 10 is greater than the set pressure. That is to say, the first pump body 101 preferentially satisfies and turns to the demand, can turn to the switching-over valve department of portal control oil circuit when having excessive fluid to improve the utilization ratio of fluid.
Further, the oil supply system also comprises a second motor 4 and a second oil pump 2 connected to the second motor 4, and the second oil pump 2 is connected to the reversing valve. The oil supply of the oil cylinder 9 is independently carried out through the second oil pump 2 and the second motor 4, the fact that the portal lifting required oil is timely provided when the duplex pump 1 cannot meet the requirement of the portal oil quantity is guaranteed, the reliability of the portal lifting control can be improved, in addition, the duplex pump 1 and the second oil pump 2 are respectively and independently controlled by the corresponding motors, and the use flexibility of the motors can be improved. Optionally, the second oil pump 2 is a gear pump, and the cost is low. In the actual operation process, the first motor 3 and the dual pump 1 are started firstly, and when the dual pump 1 cannot meet the oil quantity requirement of the lifting process of the lifting oil cylinder 9, the second motor 4 and the second oil pump 2 are started.
Furthermore, the reversing valve is a pilot reversing valve 7, and the energy accumulator 13 is connected with the first pilot cavity 701 of the pilot reversing valve 7 to switch the valve core of the reversing valve to the second working position, so that the oil liquid of the energy accumulator 13 can realize hydraulic control reversing of the reversing valve, and the reduction of electric energy consumption is facilitated. Referring to fig. 2, in the process of controlling the descending of the gantry, one path of oil of the accumulator 13 firstly enters the first pilot chamber 701, the other path of oil is located at the execution inlet of the pilot directional valve 7, and after the spool of the pilot directional valve 7 is switched to the second working position, the oil at the execution inlet enters the pilot directional valve 7 and then flows to the drainage pilot chamber of the zero-drainage valve 8. Of course, in other embodiments, the directional valve may be a solenoid valve.
Further, the second pump body 102 is connected to a brake oil path 12, and the brake oil path 12 includes an accumulator 13. By directly utilizing the energy accumulator 13 in the brake oil way 12, the energy accumulator 13 does not need to be additionally arranged in the control system, thereby being beneficial to saving the occupied space and reducing the equipment cost.
Further, the oil supply system is connected to the second pilot chamber 702 of the pilot operated directional control valve 7 to switch the spool of the pilot operated directional control valve 7 to the first working position, so that hydraulic directional control of the pilot operated directional control valve 7 is realized through the oil supply system, and saving of electric energy is facilitated. As shown in fig. 3, when the second oil pump 2 is started to supply oil to the lifting cylinder 9, one path of oil output by the second oil pump 2 firstly enters the second pilot chamber 702, the other path of oil is located at an execution inlet of the pilot directional valve 7, and after a spool of the pilot directional valve 7 is switched to a first working position, the oil at the execution inlet enters the pilot directional valve 7, flows to an execution inlet of the zero-drain valve 8, and enters the lifting cylinder 9 through the zero-drain valve 8. As shown in fig. 4, when the dual pump 1 has redundant oil to supply oil to the lifting cylinder 9, one path of oil flowing out from the priority valve 11 enters the second pilot chamber 702 first, the other path of oil is located at the execution inlet of the pilot reversing valve 7, and the rest processes are the same as those when the second oil pump 2 is started to supply oil to the lifting cylinder 9 until the oil enters the lifting cylinder 9, which is not described again in detail.
Further, the hydraulic control system for the electric forklift gantry further comprises a handle reversing valve group 18 for manual reversing, and the handle reversing valve group 18 is connected to a reversing valve. The accumulator 13 is connected to a handle reversing valve set 18 through a first pressure reducing valve 16, and the oil supply system is connected to the handle reversing valve set 18 through a second pressure reducing valve 6, and the manual reversing can be realized by moving the handle.
When the handle reversing valve group 18 is in the state of the gantry lifting position, the handle reversing valve group 18 enables the second reducing valve 6 and the second pilot cavity 702 to form a passage, and the second reducing valve 6 forms a communicated oil path between the handle reversing valve group 18 and the second pilot cavity 702, so that the valve core of the reversing valve is switched to the first working position. When the handle reversing valve group 18 is in a descending state of the gantry, the handle reversing valve group 18 enables the first reducing valve 16 and the first pilot cavity 701 to form a passage, and the first reducing valve 16 forms a communicated oil passage between the handle reversing valve group 18 and the first pilot cavity 701 so that the valve core of the reversing valve is switched to a second working position.
The accumulator 13 may be connected to the pilot switching valve 7 through a pilot oil source valve block 14, and the pilot oil source valve block 14 may include valves such as an electromagnetic switching valve 15 and a first pressure reducing valve 16, and other connection oil passages.
And manual control is adopted for reversing control, so that energy is saved. Meanwhile, the pressure reduction of the first pressure reducing valve 16 and the second pressure reducing valve 6 is convenient for realizing manual control because the pressure output by the second oil pump 2, the dual pump 1 and the accumulator 13 is large.
Further, the first pressure reducing valve 16 and the second pressure reducing valve 6 are pilot pressure reducing valves, the first pressure reducing valve 16 is opened under the control of oil of the second oil pump or oil of the dual pump through hydraulic control, and the second pressure reducing valve 6 is opened under the control of oil of the energy accumulator 13, so that electric energy is further saved. Of course, the first pressure reducing valve 16 and the second pressure reducing valve 6 may be solenoid valves or other valves.
Further, the hydraulic control system of the electric forklift mast further comprises a protection valve 17. The protection valve 17 is specifically a pilot valve. When the valve core of the pilot reversing valve 7 is in the first working position, the pilot reversing valve 7 is communicated with the zero-leakage valve 8 through a protection valve 17. The protection valve 17 is opened only when the protection pressure is higher than the preset protection pressure, so that the safety of the oil circuit can be improved.
Wherein the pilot operated directional control valve 14, the protection valve 17, the zero relief valve 8, the second pressure reducing valve 6 and other functional valves may constitute the multi-way valve 5 to control the operation of the forklift.
Further, when the valve core of the zero-leakage valve 8 is in the oil supply working position, the zero-leakage valve 8 is in one-way conduction from the pilot reversing valve 7 to the lifting oil cylinder 9, so that oil of the lifting oil cylinder 9 can be prevented from flowing back in the lifting process of the gantry, and the lifting safety is ensured.
The embodiment provides a concrete working process of electric fork truck portal hydraulic control system as follows:
when the gantry does not act, high-pressure hydraulic oil provided by the dual pump 1 driven by the first motor 3 is required for normal running of the whole vehicle. The second pump body 102 of the tandem pump 1 provides a source of oil for charging the accumulator 13, and the accumulator 13 provides the source of oil for emergency braking and parking braking. The first pump body 101 of the duplex pump 1 provides an oil source to enter the multi-way valve 5, the oil source is divided by the priority valve 11, and high-pressure oil is preferentially provided for the steering control oil circuit 10 according to steering requirements through hydraulic load feedback. In the case that sufficient steering flow has been ensured, the excess hydraulic oil is diverted to the mast working oil circuit, which allows the mast to be raised, the oil being supplied to the second pressure reducing valve 6 and to the pilot operated directional valve 7 in the direction indicated by the upper arrow, according to the oil circuit indicated by the bold solid line in fig. 4.
The second motor 4 may also be activated when the gantry needs to be raised. The second motor 4 drives the second oil pump 2 to work, as shown by the oil path with thick lines in fig. 3, a part of the hydraulic oil sucked out by the second oil pump 2 passes through the P of the multi-way valve 51The port enters a second reducing valve 6 and then enters a second pilot cavity 702 of the pilot reversing valve 7 to provide a pilot oil source so as to drive the displacement of a valve core of the pilot reversing valve 7; and part of oil is directly connected to an execution inlet of the pilot reversing valve 7, and after a valve core of the pilot reversing valve 7 moves downwards, hydraulic oil enters a rodless cavity of the lifting oil cylinder 9 to push the lifting oil cylinder 9 to extend out, so that the lifting of the gantry is realized.
When the gantry needs to be lowered, the pilot oil source valve block 1 is operated as the oil path shown by the bold line in fig. 24, the valve core of the electromagnetic directional valve 15 moves downwards, and the high-pressure oil retained in the energy accumulator 13 enters the multi-way valve 5P after being decompressed by the first decompression valve 16PAnd after the pilot liquid provided by the energy accumulator 13 sequentially pushes the pilot reversing valve 7 and the zero drain valve 8 to change the direction, the channel of the rodless cavity of the lifting oil cylinder 9 leading to the oil tank is completely opened, and the gantry descends under the action of self gravity. When the door frame descends, the high-pressure oil in the energy accumulator 13 is used for providing the pilot oil needed when the door frame descends, and the hydraulic oil in the energy accumulator 13 pushes the reversing valve, so that the energy loss caused by continuously opening the second motor 4 is avoided, the endurance time of the forklift is prolonged, the opening times of the oil pump and the motor are reduced, the working strength is reduced, and the service life is prolonged.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The hydraulic control system of the electric forklift gantry provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The utility model provides an electric fork truck portal hydraulic control system which characterized in that includes:
the reversing valve is connected to a lifting oil cylinder (9) of the gantry through a zero-leakage valve (8);
the oil supply system is connected to the reversing valve, the valve core of the reversing valve is in a first working position, and the valve core of the zero-leakage valve (8) is in the state of an oil supply working position, and the oil supply system is communicated with the lifting oil cylinder (9) through the reversing valve and the zero-leakage valve (8) so as to supply oil to the lifting oil cylinder (9) and further lift the gantry;
and the energy accumulator (13) is connected to the reversing valve, in the state of the second working position, the energy accumulator (13) is communicated with the drainage guide cavity of the zero drainage valve (8) through the reversing valve so as to switch the valve core of the zero drainage valve (8) to the drainage working position, the valve core of the reversing valve is in the second working position, the valve core of the zero drainage valve (8) is in the state of the drainage working position, the lifting oil cylinder (9) sequentially passes through the zero drainage valve (8) and the reversing valve to be communicated with the oil tank, so that oil in the lifting oil cylinder (9) flows to the oil tank, and the gantry is lowered.
2. The hydraulic control system for electric fork lift gantries of claim 1, characterized in that the oil supply system comprises a first electric motor (3) and a double pump (1) connected to the output of the first electric motor (3); a first pump body (101) in the duplex pump (1) is connected with a forklift control oil way, and the forklift control oil way comprises the reversing valve; the second pump body (102) of the double pump (1) is connected with the energy accumulator (13).
3. The hydraulic control system of an electric forklift mast according to claim 2, characterized in that the forklift control oil circuit comprises a steering control oil circuit (10) and the directional control valve, and the first pump body (101) is connected to the steering control oil circuit (10) and the directional control valve respectively via a priority valve (11) in the oil supply system.
4. The hydraulic control system of an electric forklift mast according to claim 2, characterized in that the oil supply system further comprises a second electric motor (4) and a second oil pump (2) connected to the second electric motor (4), the second oil pump (2) being connected to the reversing valve.
5. The hydraulic control system for electric forklift mast according to claim 4, characterized in that the direction valve is a pilot direction valve (7), and the accumulator (13) is connected to the first pilot chamber (701) of the pilot direction valve (7) to shift the spool of the pilot direction valve (7) to the second working position.
6. The electric fork lift mast hydraulic control system of claim 5, characterized in that the second pump body (102) is connected to a brake oil circuit (12), the brake oil circuit (12) comprising the accumulator (13).
7. The hydraulic control system for electric forklift gantries of claim 5 characterized in that the oil supply system connects the second pilot chamber (702) of the pilot operated directional control valve (7) to switch the spool of the pilot operated directional control valve (7) to the first operating position.
8. The electric forklift mast hydraulic control system according to claim 7, further comprising a handle reversing valve block (18) connected to the reversing valve for manual reversing, the accumulator (13) being connected to the handle reversing valve block (18) through a first pressure reducing valve (16), the oil supply system being connected to the handle reversing valve block (18) through a second pressure reducing valve (6);
when the handle reversing valve group (18) is in a door frame lifting position state, the second reducing valve (6) forms a communicated oil path between the handle reversing valve group (18) and the second pilot cavity (702) so that the valve core of the reversing valve is switched to the first working position;
and when the handle reversing valve group (18) is in a gantry descending position state, the first reducing valve (16) forms a communicated oil path between the handle reversing valve group (18) and the first pilot cavity (701), so that the valve core of the reversing valve is switched to the second working position.
9. The electric forklift mast hydraulic control system according to claim 8, characterized in that the first pressure reducing valve (16) and the second pressure reducing valve (6) are pilot pressure reducing valves.
10. The hydraulic control system for the electric forklift gantry according to claim 8, wherein the valve core of the zero-leakage valve (8) is in the oil supply working position, and the zero-leakage valve (8) is communicated with the lifting oil cylinder (9) in a single direction from the pilot reversing valve (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910973385.2A CN110589723B (en) | 2019-10-14 | 2019-10-14 | Hydraulic control system for electric forklift portal frame |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910973385.2A CN110589723B (en) | 2019-10-14 | 2019-10-14 | Hydraulic control system for electric forklift portal frame |
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| Publication Number | Publication Date |
|---|---|
| CN110589723A true CN110589723A (en) | 2019-12-20 |
| CN110589723B CN110589723B (en) | 2024-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910973385.2A Active CN110589723B (en) | 2019-10-14 | 2019-10-14 | Hydraulic control system for electric forklift portal frame |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201545673U (en) * | 2009-11-19 | 2010-08-11 | 浙江杭叉工程机械集团股份有限公司 | Hydraulic system for forklift |
| CN102134047A (en) * | 2011-02-15 | 2011-07-27 | 安徽合力股份有限公司 | Energy-saving hydraulic system of electric forklift |
| CN201962040U (en) * | 2011-02-21 | 2011-09-07 | 安徽合力股份有限公司 | Forklift hydraulic system with functions of priority and unloading |
| CN103910311A (en) * | 2014-04-10 | 2014-07-09 | 安徽合力股份有限公司 | Hydraulic system of empty container stacking locomotive |
| CN210710614U (en) * | 2019-10-14 | 2020-06-09 | 杭叉集团股份有限公司 | Hydraulic control system for electric forklift gantry |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10331801A (en) * | 1997-05-30 | 1998-12-15 | Kayaba Ind Co Ltd | Hydraulic control device |
| CN201545673U (en) * | 2009-11-19 | 2010-08-11 | 浙江杭叉工程机械集团股份有限公司 | Hydraulic system for forklift |
| CN102134047A (en) * | 2011-02-15 | 2011-07-27 | 安徽合力股份有限公司 | Energy-saving hydraulic system of electric forklift |
| CN201962040U (en) * | 2011-02-21 | 2011-09-07 | 安徽合力股份有限公司 | Forklift hydraulic system with functions of priority and unloading |
| CN103910311A (en) * | 2014-04-10 | 2014-07-09 | 安徽合力股份有限公司 | Hydraulic system of empty container stacking locomotive |
| CN210710614U (en) * | 2019-10-14 | 2020-06-09 | 杭叉集团股份有限公司 | Hydraulic control system for electric forklift gantry |
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| CN110589723B (en) | 2024-07-05 |
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